Mesoscopic Model of Cracking Process of NEPE Propellant Based on Cohesive Zone Model

doi:10.3969/j.issn.1000-1093.2020.11.007

Abstract

Abstract: For the sake of acquiring the mesoscopic damage mechanism of nitrate ester plasticized polyether (NEPE) propellants, a random particle model based on the molecular dynamics theory is established. The zero-thickness cohesive elements are embedded in the matrix and interface in random particle model by using Python scripting language. Considering the ductile failure of NEPE propellant, a novel polynomial-trapezoidal cohesive zone model is presented based on polynomial cohesive zone model, and a vectorized user defined material subroutine VUMAT is developed. By comparing the numerical results of particle/matrix interface dewetting model and matrix damage model, it can be concluded that the particle/matrix interface dewetting of NEPE propellants causes formation of the holes in the matrix, and the high stress around the holes is the major factor that leads to the cracking of propellants. Experimental results validate that the polynomial-trapezoidal cohesive zone model can describe the cracking process of NEPE propellants more accurately compared to bilinear cohesive zone model and polynomial cohesive zone model.

Key words: nitrateesterplasticizedpolyetherpropellant, zero-thicknesscohesiveelement, polynomial-trapezoidalcohesivezonemodel, particle/matrixinterfacedewetting, matrixdamage, numericalsimulation

CLC Number:

V512⁺.3

HOU Yufei, XU Jinsheng, GU Yongjun, ZHOU Changsheng. Mesoscopic Model of Cracking Process of NEPE Propellant Based on Cohesive Zone Model[J]. Acta Armamentarii, 2020, 41(11): 2206-2215.

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